<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" [
    <!ENTITY test PUBLIC "-//TEST" "asdsa">
]>
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
  <title>Test</title>
</head>

<body>
  <h1>Test</h1>
  <p>Test&test;</p>
</body>

</html>